Piston



10 cumulated oil Patented Dec. 3, 1929 arm u. now,

OF WELLSBORO, PENNSYLVANIA PISTON Application filed September 6, 1927.Serial No. 217,718.

This invention aims to provide a novel piston construction for aninternal combustion engine, and, specifically, to improve theconstruction of the groove for the piston ring,

the groove being widened at its inner end or side to form a chamber foroil, novel means being provided for conducting oil into the chamber asthe piston reciprocates, and novel means being supplied for conductingthe acawa thereby preventing the oil from working into the combustionspace of the internal combustion engine and fouling the engine withcarbon.

It is within the province of the disclosure to improve generally and toenhance the utility of devices of that type to which the inventionappertains.

With the foregoing and other objects in view which will appear as thedescription proceeds, the invention resides in the combina tion andarrangement of parts and in the de-' talls of construction hereinafterdescribed and claimed, it being understood that changes in the preciseembodiment of the invention herein disclosed,may be made within thescope of what is claimed, without departing from the spirit of theinvention.

In the drawings Figure 1 shows in longitudinal section, a portion of thecylinder of an internal combustion engine, and a portion of a pistonwherein the device forming the subject mat ter of this application hasbeen embodied;

Figure 2 is asection 0n the line 22 of Figure 1;

Figure 3 is a longitudinal sectionshowing a modification;

Figure 4 is a section on the line 4-4 of Figure 3;

Figure 5 is a sectioncut like Figures 1 and 3, but showing amodification.

As to the form depicted in Figures 1 and 2, there appears the cylinder 1of an internal combustion engine, wherein the piston 2 is mounted forreciprocation. The piston 2 has a ring groove 3, and oppositely slantingwalls 4 and 5, the walls forming a widened chamber 6 at the inner sideof the ring groove. A ring 7 of the usual expansion type, or of anydesired construction, is mounted in the ring groove 3 and has contactwith the wall of, the cylinder 1. The piston 2 has a transverse passage8 of approximately semi-circular orm, the passage opening into the ringgroove 3 and being located immediately adjacent to the ring 7 and on thecrank case side thereof, that is, on that side of the piston ring whichis remote from the combustion chamber of the internal combustion engine.The inner end of the passage 8 is in communication with the chamber 6,as the drawings clearly show. The piston 2 is cut away, by beveling, asat 9, at one corner of the ring groove 3, to collect oil and carry itinto the passage 8. The piston 2 is supplied with an oil outlet for thechamher 6, the oil outlet being in the form of a bore 10 inclined withrespect to the axis of reciprocation of the piston and discharging intothe piston at the inner edge of the slanting wall 5. In practicaloperation, the oil which finds its way toward the combustion chamber, between the piston and the cylinder, moves over the beveled surface at 9and is carried by the passage .8 into the chamber 6, and as the pistonreciprocates, the surplus oil is shaken out through the outlet 10, muchas a liquid can be shaken out of an inverted and uncorked bottle that isreciprocated vertically in the hand of an operator. The operation issuch that the oil is disposed of before it has an opportunity to workpast the ring 7 and into the combustion chamber of the engine. There maybe as many of the passages 8, and as many of the outlets 10 as isconsidered expedient, the same being distributed circumferentiallyaround the piston 2 in spaced relation.

In Figures 3 and 4, parts hereinbefore described have been designated bynumerals previously used, with the sufiix a. The oil outlet is in theform of a slot 11 formed in the piston 2 and intersecting the base ofthe passage 8*}, there being an undercut supplemental groove 12 in theiston 2" at the outer end of the slot 11. T ere may be as many of theslots 11 as desired, and as many of the passages or recesses 8, and thegroove '12 extends unbrokenly around the piston 2.

In Figure 5, parts hereinbefore described have been designated bynumerals previously used, with the suffix b. The form under discussionis like the form shown in Figure 1, aside from the fact that theinclined wall 4 is done away with, and the beveling at 9 is replaced bya rectangular recess 14 which extends unbrokenly around the piston, likethe beveling shown at 9.

What is claimed is 1. In a device of the class described, a pistonhaving a ring groove and oppositely slanting wallsv forming a widenedchamber at the inner side of the ring groove, a ring in the ring groove,the piston having a transverse passage of approximately semi-circularform, the passage opening into the ring groove and being locatedimmediately adja cent to the ring, on the crank case side thereof, theinner end of the passage being in communication with the chamber, thepiston being supplied with an oil outlet for the chamber.

2. In a device of the class described, a piston having a ring groove andoppositely slanting Walls forming a widened chamber at the inner side ofthe ring groove, 9. ring in the ring groove, the piston having atransverse passage of approximately semi-circular form, the passageopening into the ring groove and being located immediately adjacent tothe ring, on the crank case side thereof, the inner end of the passagebeing in communication with the chamber, the piston being supplied withan oil outlet for the chamber, the oil outlet being in the form of aslot fashioned in the piston and intersecting the base of the passage.

3. In a device of the class described, a piston having a ring groove andoppositely slanting walls forming a widened chamber at the inner side ofthe ring groove, a ring in the ring groove, the piston having a trans--'verse passage, the passage opening into the ring groove and beinglocated immediately adjacent to the ring, on the crank case sidethereof, the inner end of the passage being in communication with thechamber, the piston 7 being supplied with an oil outlet for the chamber.

4;. In a device of the class described, a piston having a ring grooveand oppositely slanting walls forming a widened chamber at the innerside of the ring groove, a ring in the ring groove, the piston having atransverse passage, the passage opening into the ring groove and beinglocated immediately adjacent to the ring, on the crank case sidethereof, the inner end of the passage being in communication with thechamber, the piston being. supplied with an oil outlet for the chamber,the oil outlet being in the form of a slot fashioned in the piston andintersecting the base of the passage.

In testimony that I claim the foregoing as niy own, I have heretoaflixed my signature.

FRED M. HOWE.

